Handle all YAML parser exceptions in .gitlab-ci.yml (fixes #41209)

- Move the exception handling as close to the source as possible to
avoid leaking Psych ahstraction
- Also remove unnecessary rescue all statement from LintsController.
This should not be necessary anymore since any YAML errors should all be
caught by the #validation_message method.

1 files changed, 10 insertions, 0 deletions

diff --git a/spec/lib/gitlab/ci/config/loader_spec.rb b/spec/lib/gitlab/ci/config/loader_spec.rb
index 2d44b1f60f1..590fc8904c1 100644
--- a/spec/lib/gitlab/ci/config/loader_spec.rb
+++ b/spec/lib/gitlab/ci/config/loader_spec.rb
@@ -38,6 +38,16 @@ describe Gitlab::Ci::Config::Loader do
     end
   end
 
+  context 'when there is an unknown alias' do
+    let(:yml) { 'steps: *bad_alias' }
+
+    describe '#initialize' do
+      it 'raises FormatError' do
+        expect { loader }.to raise_error(Gitlab::Ci::Config::Loader::FormatError, 'Unknown alias: bad_alias')
+      end
+    end
+  end
+
   context 'when yaml config is empty' do
     let(:yml) { '' }